it took a minute to arrive, but the devices arrived well packed and I am ready to use them.

The monitor is easy to carry and the readings are useful. I mainly use it indoors and would like a slightly brighter display option.

CO2, temperature, and humidity are all easy to check. The device is compact, though I wish the buttons were slightly larger.

The CO2 reading and alarm features are straightforward and useful. It took me a little time to get familiar with the settings.

I like the USB-C charging and the ability to move it around. A longer cable in the box would have been nice.

The readings are clear and I like the portable design. I would prefer an even larger screen, but it works well for a small monitor.

I like being able to check changing CO2 levels throughout the day. The monitor is small enough to keep nearby without getting in the way.

I can quickly see the CO2 number without navigating through menus. That is the main thing I wanted from a monitor like this.

Easy to charge, easy to pack, and easy to read. The three readings cover what I wanted for indoor spaces.

For a compact device, it includes the main functions I wanted: NDIR CO2 monitoring, temperature, humidity, and an audible alert.

The combination of the screen indicator and buzzer makes changing conditions easier to notice.

The compact size and rechargeable battery make it easy to use in either space. I especially like the clear CO2 number.

CO2 is the main reason I wanted it, but temperature and humidity make it more useful for everyday indoor monitoring.

The screen gives the information directly and the menus are not overwhelming. I prefer this kind of simple design.

The live CO2 reading helps me decide when to air out the room instead of just guessing.

I have used it in different indoor spaces while traveling. It is light, rechargeable, and does not take much room in my bag.

It sits neatly beside my computer and gives me a quick look at CO2, temperature, and humidity while I work.

The visual status indicator makes it quick to understand the CO2 condition before even focusing on the exact number.

Charging is simple and I do not need a special cable. The battery also makes the monitor easy to place where I need it.

I wanted something simple that works directly from the device. Everything I need is shown on the screen.

I like having humidity and temperature next to the CO2 reading because it gives more context about the room.

The 76 mm size is convenient for a desk or nightstand. It feels like a practical size for travel as well.

I use it in a small meeting room and it is interesting to see how the CO2 level changes as more people come in.

The main numbers are large enough to check quickly from across a desk. The color indicator is helpful too.

The battery lets me carry it from the office to the bedroom without having to find an outlet every time.

Exactly what I wanted for checking indoor CO2 without extra features I would not use. The temperature and humidity display is a nice addition.

I noticed the CO2 level can increase when the door and windows stay closed. This monitor makes those changes easy to see.

It is easy to place on a desk or shelf and check throughout the day. The rechargeable design is very convenient.

The main CO2 number is easy to spot and the other readings do not make the screen feel crowded.

This makes it easier to notice when indoor CO2 starts rising. The screen gives a quick visual reference without needing a phone.

The device is quite compact but still shows the information I care about: CO2, temperature, humidity, and battery level.

It is helpful for seeing how CO2 changes when several people are in the room. The display updates are easy to follow.